Lo1.3 diagnosing computer systems

Plan & Prepare for Diagnosis

Lesson 1of Computer Systems

ErrorsDIAGNOSING COMPUTER SYSTEMS

Lesson 1.3

NUEVA ECIJA HIGH SCHOOL

COMMON PC PROBLEMS & SOLUTIONS

1. Check the POST. This is generally the first or second thing that appears on a computer after turning on the power. This appears before the operating system begins to load. The POST will display any problems found with hardware that makes the computer unable to boot, POST may also display problems with hardware that allow the computer to boot, but not operate at its full capacity during operation.



2. Notice the load time of the OS (operating system). A longer than usual load time may indicate errors in the hard drive.



3. Notice any graphics problems once the OS has loaded. Reduced graphics may indicate driver failures or hardware failures with graphic cards.



4. Perform an auditory test. An auditory test is an unorthodox, but still effective way of judging how a computer is working. With the computer on and running, play any decent length audio file (usually above 30 sec). If the audio is choppy or slow, it usually means that the processor is working at an elevated level, or there is not enough RAM to run all programs loading. Changing the startup sound is a great way to apply this test. Another issue associated with choppy sounds is PIO (Programmed Input/Output) Mode. This affects how the hard drive reads and writes data from a drive. Switching to Direct Memory Access (DMA) allows for faster reads and writes, and can sometimes repair choppy audio.



5. Check any newly installed hardware. Many operating systems, especially Windows, can conflict with new drivers. The driver may be badly written, or it may conflict with another process. Windows will usually notify you about devices that are causing a problem, or have a problem. To check this use the Device Manager, this can be accessed by entering the Control Panel, clicking the System icon, clicking the Hardware tab, and clicking on Device Manager. Use this to check and arrange the properties of hardware.



6. Check any newly installed software. Software may require more resources than the system can provide. Chances are that if a problem begins after software starts, the software is causing it. If the problem appears directly upon startup, it may be caused by software that starts automatically on boot.



• 7. Check RAM and CPU consumption. A common problem is a choppy or sluggish system. If a system is choppy it is good practice to see if a program is consuming more resources than the computer can provide.



• 7. CON’T. An easy way to check this is to use the Task Manager, right click on the taskbar select Task Manager, and click the Processes tab. The CPU column contains a number that indicates the percentage of CPU the process is consuming.



• 7. CON’T. The Memory Usage column indicates how much memory a process is consuming.

• Network HUB • Network cable • Network card



• 8. Listen to the computer, if the hard drive is scratching or making loud noises, shut off the computer and have a professional diagnose the hard drive. Listen to the CPU fan, this comes on a high speed when the CPU is working hard, and can tell you when the computer is working beyond its capacity.



• 9. Run a virus and malware scan. Performance problems can be caused by malware on the computer. Running a virus scan can unearth any problems. Use a commonly updated virus scanner (such as Norton Antivirus or Avast! Antivirus)



• 10. Check for the problem in safe mode. To enter safe mode, tap F8 repeatedly during POST (this works on most systems). If the problem persists in safe mode, it is a fair bet that the operating system itself is to blame.


Common Trouble shootingfor Computer Units

1. Double check the power connections. 2. Voltage Regulator and power supply could

cause power failure in the computer unit. 3. Check the power cords and cable

connectors in your computer unit. 4. Unseated card. Loose cards could cause

malfunction. 5. Check the boot sequence configuration in

the advance BIOS (Basic Input /Output Unit) setup.


Diagnosing Network Connection

Things to look for if a PC is connected to the internet or network: • First check the cable connecting to the network

card into the network hub. • Check the back of the computer to see if the

network card light is on • Check the network cable ( use cable tester) • Check the network HUB (use multi-tester)


DEX_Identify the following: 1. Moderately dangerous types of errors among those that can pop up on

your PC. 2. Caused by malfunctioning hardware components, and are characterized

by short beep sounds from the tiny internal speaker of your motherboard. 3. Caused at any point of time. As the name suggests, these are caused by

applications while those are running. 4. Usually caused by corrupted driver files or malfunctioning hardware

components. 5. Caused by corrupted or malfunctioning system files or software

executables. 6. Caused by corrupted hardware, especially malfunctioning RAM modules

and bad sectors on hard disks. 7. Caused by problems faced by browsers when trying to access a website.

Education

Lo1.3 diagnosing computer systems